Differences of Main Enrichment Factors of S1l 1 1-1 Sublayer Shale Gas in Southern Sichuan Basin

Xuewen Shi, Chao Luo, Gaohui Cao, Yifan He, Yi Li, Kesu Zhong, Wenbin Jiang and Mian Lin
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Xuewen Shi: Shale Gas Research Institute of Petrochina Southwest Oil & Gas Field Company, Chengdu 610051, China
Chao Luo: Shale Gas Research Institute of Petrochina Southwest Oil & Gas Field Company, Chengdu 610051, China
Gaohui Cao: Institute of Mechanics, Chinese Academy of Sciences, Beijing100190, China
Yifan He: Shale Gas Research Institute of Petrochina Southwest Oil & Gas Field Company, Chengdu 610051, China
Yi Li: Shale Gas Research Institute of Petrochina Southwest Oil & Gas Field Company, Chengdu 610051, China
Kesu Zhong: Shale Gas Research Institute of Petrochina Southwest Oil & Gas Field Company, Chengdu 610051, China
Wenbin Jiang: Institute of Mechanics, Chinese Academy of Sciences, Beijing100190, China
Mian Lin: Institute of Mechanics, Chinese Academy of Sciences, Beijing100190, China

Energies, 2021, vol. 14, issue 17, 1-21

Abstract: In this study, shale cores from 20 wells in the S1l 1 1-1 sublayer of Longmaxi Formation buried in shallow shale (<3500 m) and deep shale (>3500 m) in the southern Sichuan Basin, China were collected to compare their pore structures and gas-bearing properties using multiple experiments. Results showed that the deep layer has relatively lower brittle mineral content, which is disadvantageous in terms of the higher requirements it imposes on hydraulic fracturing. Results also showed that the most important factor controlling the differential enrichment of S1l 1 1-1 shale gas in southern Sichuan Basin is porosity. Moreover, the porosity composition of shallow shale and deep shale has significant differences: the porosity of shallow shale is dominated by organic pores, while for deep shale, both organic and inorganic pores are important. The inorganic pores provide significant storage space for free gas in deep shale; their contribution warrants more attention. We also found that the difference in organic porosity of the shallow and deep shale samples resulted from large differences in pore development ability, while the highest inorganic porosity was concentrated near the optimal mineral composition when the content of quartz plus feldspar plus pyrite was about 70%. This study revealed the primary factor controlling the difference in gas content between shallow and deep shale and detailed the characteristics of microscopic pore structure, providing a basis for the exploration and development of deep shale gas in the Wufeng-Longmaxi Formation in the southern Sichuan Basin.

Keywords: S1l 1 1-1 sublayer; gas content; organic pore; inorganic pore (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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